(CNN)The massive wildfire that forced almost 90,000 people to evacuate in Alberta is growing and approaching the neighboring province of Saskatchewan, Canadian officials said.

Dry and extremely windy conditions are fueling the blaze, which has scorched more than 1,560 square kilometers (602 square miles) and ravaged the city of Fort McMurray, Public Safety Minister Ralph Goodale said Saturday.

"The situation remains unpredictable and dangerous," he told reporters.

Alberta is "tinder dry," he said, adding there was a possibility of a drop in temperature and a slight chance of rain early next week.

A downpour is needed to tame the fire that is the size of Hong Kong and almost 25% bigger than New York City. It has displaced about 88,000 people, wiped out at least 1,600 structures and sent plumes of smoke as far away as Iowa. The fire may double in size, Goodale said.

The blaze is moving in a northeast direction and could reach the border with Saskatchewan by the end of Saturday, Alberta Premier Rachel Notley said.

The response has been massive. Notley said more than 500 firefighters are battling the blaze around Fort McMurray, with the help of 15 helicopters and 14 air tankers. More than 1,400 firefighters and 133 helicopters are fighting blazes across the province.

Notley said the Suncor and Syncrude oil companies to the north of Fort McMurray are evacuating personnel. Officials stressed that the company properties don't appear to be in danger from the fire.

"I met families who had picked up and evacuated on a few hours' notice, who are understandably worried and anxious about what is going to happen next, about their children's schooling, about their belongings," she said.

One bit of good news: No fatalities directly related to the fire have been reported.

Remains of a building stand in the neighborhood of Abasand in Fort McMurray on May 13.

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Burned trees dot the landscape in Fort McMurray on May 13.

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Canadian Prime Minister Justin Trudeau, left, and Fort McMurray Fire Chief Darby Allen look over the devastation during a visit to Fort McMurray on May 13.

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Charred remains of homes are seen in Fort McMurray on May 13.

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A police officer looks over a destroyed building in the Abasands neighborhood of Fort McMurray on Monday, May 9.

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Burned ground surrounds a sign welcoming visitors to Fort McMurray on May 9. The wildfire began Sunday, May 1, and had torched nearly 617,800 acres as of May 10, according to Alberta's Wildfire Management agency. The cause of the blaze was unclear.

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Remains of a burned-out house sit near intact homes in Fort McMurray on May 9.

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Smoke fills the air as a police officer checks vehicles at a roadblock along Highway 63 leading into Fort McMurray on Sunday, May 8.

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Rodney Howse gets water at a donation center on May 8. The center was established to help evacuees who were forced from their homes by the wildfire.

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A ball of flame rises behind abandoned vehicles on Highway 63 near Fort McMurray on Saturday, May 7.

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Foundations of homes are all that remain in parts of a residential neighborhood in Fort McMurray on May 7.

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Skeletons of patio furniture are seen on May 7.

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A helicopter helping with the Fort McMurray wildfire takes off from a staging base near Conklin, Alberta, on May 7.

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Remains of a home in Fort McMurray are seen on May 7.

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Charred vehicles sit in a heavily damaged residential neighborhood on May 7.

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Smoke and flames create a dramatic sunset near Fort McMurray on Friday, May 6.

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A huge plume of smoke from the wildfires rises over Fort McMurray in this aerial photograph taken on May 6.

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The remains of a swing sits in a residential neighborhood destroyed by the fire on May 6 in Fort McMurray.

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A plane drops fire retardant in Fort McMurray on May 6.

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A police helicopter lifts off through dust and smoke on May 6.

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Drivers wait for clearance to take firefighting supplies into town on Thursday, May 5, outside Fort McMurray.

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A member of the Royal Canadian Mounted Police surveys wildfire damage in Fort McMurray. The RCMP tweeted the photo on May 5.

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Tyra Abo sits on a cot at a makeshift evacuation center in Lac la Biche, Alberta, on May 5.

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A woman picks through donated clothing and goods at a makeshift evacuation center in Lac la Biche on May 5.

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The wildfire moves toward the town of Anzac on Wednesday, May 4.

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People camp out at a beach south of Fort McMurray on May 4.

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Evacuees watch the wildfire near Fort McMurray on May 4.

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Traffic is at a standstill on Highway 63 south as residents flee the wildfire on May 4.

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Robert Parker, left, and Matt Jones siphon gas from two snowmobiles for their truck on May 4.

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A helicopter flies past the wildfire in Fort McMurray on May 4.

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The wildfire rages through Fort McMurray on Tuesday, May 3.

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The wildfire burns through northern Alberta in this image released by NASA on May 3.

"It was something like Armageddon," said Morgan Elliott, who traveled with his fiancee, Cara Kennedy, and their baby, Abigail. "Everything was burnt, houses gone. Leaving the city, it was like a scene out of a movie. It reminded me of the TV show 'The Walking Dead' where you're going on the highway, and there's just abandoned vehicles everywhere; hundreds of cars, just abandoned vehicles."

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Vehicles headed south down Highway 63, the lone road open for people relocating to emergency shelters or the homes of friends or family, the Regional Municipality of Wood Buffalo reported.

Notley said 12,000 people have been airlifted over the past two days and 7,000 were able to drive out. Some 15,000 people remain stranded north of the devastated city, but not all will leave, she said.

Many evacuees are expected eventually to wind up in Edmonton, the provincial capital some 379 kilometers (236 miles) to the south, or Calgary, where residents and officials were working to set up accommodations for the influx of temporary residents.